Billing Software

Alright. I have created for myself hosting billing software. It currently does:

=Adding Plans with Monthly, Quarterly, Bi-Yearly, and Yearly Plans
=Takes the Orders
=Sends an email with a link to pay (either PayPal or 2checkout)
=After they pay you must go on and click "Create" next to their order (the ID is included with ther PayPal or 2checkout payment)
==The payment is reoccuring at the payment processor (not like the rest that send out bills every month
=Terminate Accounts
=Total you are making per month
=Total per year
=Subtract a certain amount from the monthly/yearly (to account for server pricing)
=Interfaces w/ WHM/Cpanel

I would like to make a brand new system that is much more eyepleasing and easier to use and has more features and then sell it for a very low price. It would either be one-time with a certain amount of support and access to updates for X amoutn of time or be a monthly charge to use it.

I need input from all hosting companies on what I should add to it to make it better and how I should charge. Also if anyone has any code that they could help me with (i.e. and idea and the code for it), please contact me through email (jesse@getitconnected.net) and let me know.

I would also like to possibly set it up so that it "blends" with the Xskin or the like so that when a user logs into cpanel, they also see what they are paying, be able to upgrade, etc.